You may have already read it, since I recognize your name from other comments, but I do go into more detail regarding NAC, and possible benefits for ADHD in my previous Medium article:

https://medium.com/wise-well/a-supplement-with-a-knack-for-strange-effects-74f64f25e0a1

and with more emphasis on ADHD in my YouTube video: https://www.youtube.com/watch?v=rP0IT31akVc

My YouTube videos tend to be more narrowly focused on ADHD, whereas I am trying to reach a broader mental and physical health audience on Medium.